html {
    box-sizing: border-box;
    min-height: 100vh;
    display: flex; /* 弹性格式化上下文 */
    justify-content: center; /* 盒子主轴居中 */
    align-items: center; /* 盒子次轴居中 */
    vertical-align: center; /* 兄弟间的居中 */
    text-align: center; /* 行内文本居中 */
}
*,*::before,*::after {
    box-sizing: inherit;
}
.wrapper {
    padding: 20px;
    max-width: 350px;
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: 0 0 0 10px rgba(0, 0, 0, 0.1);
}
h2 {
    text-align: center;
    margin: 0;
    font-weight: 200;
}
.plates {
    margin: 0;
    padding: 0;
    text-align: left;
    list-style: none;
}
.plates li {
    border-bottom: 1px solid rgba(0, 0, 0, 0.2);
    padding: 10px 0;
    font-weight: 100;
    display: flex; /* 设置弹性格式化上下文 */
}
.plates label {
    flex:1;
    cursor: pointer;
}
.plates input {
    display: none;
}
.plates input + label:before {
     content: "⬜️";
     margin-right: 10px;
}
.plates input:checked + label:before {
    content: "✅";
}
.add-items {
    margin-top: 20px;
}
.add-items input {
    padding: 10px;
    outline: 5px solid rgba(14,14,211,0.8);
    border: 1px sloid rgba(0, 0, 0, 0.1);
}